目录

1. Main.vue（主组件）

2. TopNav.vue（子组件...头部） 

3. LeftAside.vue（子组件...左侧） 

4. 配置路由

5. 在main.js里面设置Bus总线 

6. 效果 

---

•  来了老弟话不多说哈！直接上代码了

 1. Main.vue（主组件）

• src --> views 文件夹下创建 

<template>
  <el-container class="main-container">
    <el-aside v-bind:class="asideClass">
      <LeftAside></LeftAside>
    </el-aside>
    <el-container>
      <el-header class="main-header">
        <TopNav></TopNav>
      </el-header>
      <el-main class="main-center">Main</el-main>
    </el-container>
  </el-container>
</template>

<script>
  // 导入组件
  import TopNav from '@/views/TopNav.vue'
  import LeftAside from '@/views/LeftAside.vue'

  // 导出模块
  export default {
    name: "Main",
    data: function() {
      return {
        collapsed: false
      }
    },
    methods: {

    },
    computed: { //计算属性
      asideClass: function() { //如果collapsed属性为true就展开不样式 反之就展开样式
        return this.collapsed ? "main-aside-collapsed" : "main-aside";
      }
    },
    components: { //引入组件
      TopNav,
      LeftAside

    },
    created: function() { //钩子函数
      this.$root.Bus.$on("Handle", value => {
        this.collapsed = value;
      });
    }
  };
</script>
<style scoped>
  .main-container {
    height: 100%;
    width: 100%;
    box-sizing: border-box;
  }

  /* 不展开样式*/
  .main-aside-collapsed {
    /* 在CSS中，通过对某一样式声明! important ，可以更改默认的CSS样式优先级规则，使该条样式属性声明具有最高优先级 */
    width: 64px !important;
    height: 100%;
    background-color: #334157;
    margin: 0px;
  }

  /* 展开样式*/
  .main-aside {
    width: 240px !important;
    height: 100%;
    background-color: #334157;
    margin: 0px;
  }

  .main-header,
  .main-center {
    padding: 0px;
    border-left: 2px solid #333;
  }
</style>

2. TopNav.vue（子组件...头部） 

•  src --> views 文件夹下创建 

<template>
  <el-menu class="el-menu-demo" mode="horizontal" background-color="#334157" text-color="#fff" active-text-color="#fff">
    <el-button class="buttonimg">
      <img class="showimg" :src="collapsed?imgshow:imgsq" @click="doToggle()">
    </el-button>
    <el-submenu index="2" class="submenu">
      <template slot="title">超级管理员</template>
      <el-menu-item index="2-1">设置</el-menu-item>
      <el-menu-item index="2-2">个人中心</el-menu-item>
      <el-menu-item @click="exit()" index="2-3">退出</el-menu-item>
    </el-submenu>
  </el-menu>
</template>

<script>
  export default {
    name: "TopNav",
    data: function() {
      return {
        collapsed: false,
        imgshow: require("../assets/img/show.png"),
        imgsq: require("../assets/img/sq.png")
      }
    },
    methods: {
      doToggle: function() { //主要控制collapsed为true和false
        this.collapsed = !this.collapsed;
        this.$root.Bus.$emit("Handle", this.collapsed);
      },
      exit:function(){
       this.$router.push({
         path:'/'
       })
      }
    }

  }
</script>

<style scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    border: none;
  }

  .submenu {
    float: right;
  }

  .buttonimg {
    height: 60px;
    background-color: transparent;
    border: none;
  }

  .showimg {
    width: 26px;
    height: 26px;
    position: absolute;
    top: 17px;
    left: 17px;
  }

  .showimg:active {
    border: none;
  }
</style>

3. LeftAside.vue（子组件...左侧） 

•  src --> views 文件夹下创建 

<template>
  <el-menu default-active="2" class="el-menu-vertical-demo" background-color="#334157" text-color="#fff"
    active-text-color="#ffd04b" :collapse="collapsed" :collapse-transition="bb">
    <!-- <el-menu default-active="2" :collapse="collapsed" collapse-transition router :default-active="$route.path" unique-opened class="el-menu-vertical-demo" background-color="#334157" text-color="#fff" active-text-color="#ffd04b"> -->
    <div class="logobox">
      <img class="logoimg" src="../assets/img/logo.png" alt="">
    </div>
    <el-submenu index="1">
      <template slot="title">
        <i class="el-icon-location"></i>
        <span>导航一</span>
      </template>
      <el-menu-item-group>
        <template slot="title">分组一</template>
        <el-menu-item index="1-1">选项1</el-menu-item>
        <el-menu-item index="1-2">选项2</el-menu-item>
      </el-menu-item-group>
      <el-menu-item-group title="分组2">
        <el-menu-item index="1-3">选项3</el-menu-item>
      </el-menu-item-group>
      <el-submenu index="1-4">
        <template slot="title">选项4</template>
        <el-menu-item index="1-4-1">选项1</el-menu-item>
      </el-submenu>
    </el-submenu>
    <el-menu-item index="2">
      <i class="el-icon-menu"></i>
      <span slot="title">导航二</span>
    </el-menu-item>
    <el-menu-item index="3" disabled>
      <i class="el-icon-document"></i>
      <span slot="title">导航三</span>
    </el-menu-item>
    <el-menu-item index="4">
      <i class="el-icon-setting"></i>
      <span slot="title">导航四</span>
    </el-menu-item>
  </el-menu>
</template>
<script>
  export default {
    name: "LeftAside",
    data: function() {
      return {
        collapsed: false,
        bb: true
      }
    },
    methods: {},
    created: function() { //钩子函数
      this.$root.Bus.$on("Handle", value => {
        this.collapsed = value;
      });
    }

  }
</script>
<style>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 240px;
    min-height: 400px;
  }

  .el-menu-vertical-demo:not(.el-menu--collapse) {
    border: none;
    text-align: left;
  }

  .el-menu-item-group__title {
    padding: 0px;
  }

  .el-menu-bg {
    background-color: #1f2d3d !important;
  }

  .el-menu {
    border: none;
  }

  .logobox {
    height: 40px;
    line-height: 40px;
    color: #9d9d9d;
    font-size: 20px;
    text-align: center;
    padding: 20px 0px;
  }

  .logoimg {
    height: 40px;
  }
</style>

 4. 配置路由

import Vue from 'vue'
import Router from 'vue-router'
//引入Main组件
import Main from '@/views/Main'

Vue.use(Router)

export default new Router({
  routes: [{
      path: '/Main',
      name: 'Main',
      component: Main
    }
  ]
})

5. 在main.js里面设置Bus总线 

new Vue({
  el: '#app',
  router,
  components: {
    App
  },
  template: '<App/>',
  data: {//Bus总线
    //自定义的事件总线对象，用于父子组件的通信
    Bus: new Vue()
  }
})

6. 效果 

• 展开效果 

•  关闭效果